[Mesa-dev] [PATCH] i965/fs: Remove force_sechalf stack.

[Kenneth Graunke]

Only Gen4 color write setup uses the force_sechalf flag, and it only
sets it on a single instruction.  It also already has to get a pointer
to the instruction and manually set the saturate flag, so we may as well
just set force_sechalf the same way and avoid the complexity of a stack.
---
 src/mesa/drivers/dri/i965/brw_fs.cpp         | 14 --------------
 src/mesa/drivers/dri/i965/brw_fs.h           |  3 ---
 src/mesa/drivers/dri/i965/brw_fs_visitor.cpp |  6 +-----
 3 files changed, 1 insertion(+), 22 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp
index ae26d07..30f7286 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -649,19 +649,6 @@ fs_visitor::pop_force_uncompressed()
    assert(force_uncompressed_stack >= 0);
 }
 
-void
-fs_visitor::push_force_sechalf()
-{
-   force_sechalf_stack++;
-}
-
-void
-fs_visitor::pop_force_sechalf()
-{
-   force_sechalf_stack--;
-   assert(force_sechalf_stack >= 0);
-}
-
 /**
  * Returns how many MRFs an FS opcode will write over.
  *
@@ -2511,7 +2498,6 @@ fs_visitor::run()
       }
    }
    assert(force_uncompressed_stack == 0);
-   assert(force_sechalf_stack == 0);
 
    if (failed)
       return false;
diff --git a/src/mesa/drivers/dri/i965/brw_fs.h b/src/mesa/drivers/dri/i965/brw_fs.h
index bcf38f3..7af8d1f 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.h
+++ b/src/mesa/drivers/dri/i965/brw_fs.h
@@ -332,8 +332,6 @@ public:
 
    void push_force_uncompressed();
    void pop_force_uncompressed();
-   void push_force_sechalf();
-   void pop_force_sechalf();
 
    void emit_dummy_fs();
    fs_reg *emit_fragcoord_interpolation(ir_variable *ir);
@@ -471,7 +469,6 @@ public:
    const unsigned dispatch_width; /**< 8 or 16 */
 
    int force_uncompressed_stack;
-   int force_sechalf_stack;
 };
 
 /**
diff --git a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
index e70d6bf..815e421 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
@@ -1872,8 +1872,6 @@ fs_visitor::emit(fs_inst *inst)
 {
    if (force_uncompressed_stack > 0)
       inst->force_uncompressed = true;
-   else if (force_sechalf_stack > 0)
-      inst->force_sechalf = true;
 
    inst->annotation = this->current_annotation;
    inst->ir = this->base_ir;
@@ -2078,12 +2076,11 @@ fs_visitor::emit_color_write(int target, int index, int first_color_mrf)
 	 inst->saturate = c->key.clamp_fragment_color;
 	 pop_force_uncompressed();
 
-	 push_force_sechalf();
 	 color.sechalf = true;
 	 inst = emit(MOV(fs_reg(MRF, first_color_mrf + index + 4, color.type),
                          color));
+	 inst->force_sechalf = true;
 	 inst->saturate = c->key.clamp_fragment_color;
-	 pop_force_sechalf();
 	 color.sechalf = false;
       }
    }
@@ -2320,7 +2317,6 @@ fs_visitor::fs_visitor(struct brw_context *brw,
    this->live_intervals_valid = false;
 
    this->force_uncompressed_stack = 0;
-   this->force_sechalf_stack = 0;
 
    memset(&this->param_size, 0, sizeof(this->param_size));
 }
-- 
1.8.0.3